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authorRomain Fliedel <rfliedel@freebox.fr>2018-11-05 11:01:19 +0100
committerDaniel Stenberg <daniel@haxx.se>2018-11-20 19:58:45 +0100
commit6765e6d9e6a32bb4fc666d744cb57e2d55d4e13b (patch)
tree4cef970f234a13fc1a75d28c93bda49a33226e74 /tests/data/test106
parent47ccb2d204eb9c1d3e98b3febd616af42d82c184 (diff)
ares: remove fd from multi fd set when ares is about to close the fd
When using c-ares for asyn dns, the dns socket fd was silently closed by c-ares without curl being aware. curl would then 'realize' the fd has been removed at next call of Curl_resolver_getsock, and only then notify the CURLMOPT_SOCKETFUNCTION to remove fd from its poll set with CURL_POLL_REMOVE. At this point the fd is already closed. By using ares socket state callback (ARES_OPT_SOCK_STATE_CB), this patch allows curl to be notified that the fd is not longer needed for neither for write nor read. At this point by calling Curl_multi_closed we are able to notify multi with CURL_POLL_REMOVE before the fd is actually closed by ares. In asyn-ares.c Curl_resolver_duphandle we can't use ares_dup anymore since it does not allow passing a different sock_state_cb_data Closes #3238
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